Pacific Gas & Electric

, the financially troubled utility unit of

PG&E

(PCG) - Get PG&E Corporation Report

, filed for reorganization under Chapter 11 of the U.S. Bankruptcy Code on Friday, saying that its unreimbursed energy costs are now increasing by more than $300 million a month.

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The filing doesn't affect PG&E or the parent company's other units, including

National Energy Group

.

"We chose to file for Chapter 11 reorganization affirmatively because we expect the court will provide the venue needed to reach a solution, which thus far

California and the state's regulators have been unable to achieve," Pacific Gas & Electric said in a press release. "The regulatory and political processes have failed us, and now we are turning to the court."

The San Francisco-based utility plans to continue normal electric and gas transmission and distribution functions during the Chapter 11 process.